<template>

  <div class="login_container">
     <div class="login_box">
       <!-- 头像区 -->
       <div class="avatar_box">
         <img src="../assets/logo.png" alt="avatar" />
       </div>
       <!-- 登录表单 -->
       <div>
         <el-form
           ref="loginFormRef"
           :rules="loginFormRules"
           :model="loginForm"
           label-width="60px"
           class="login_form"
         >
           <el-form-item label="账号" prop="username">
             <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
           </el-form-item>
           <el-form-item label="密码" prop="password">
             <el-input
               v-model="loginForm.password"
               type="password"
               prefix-icon="iconfont icon-3702mima"
             ></el-input>
           </el-form-item>
           <el-form-item class="btns">
             <el-button type="primary" @click="login">登录</el-button>
             <el-button type="info" @click="resetLoginForm">重置</el-button>
           </el-form-item>
         </el-form>
       </div>

     </div>
  </div>

</template>

<script>
  export default {
    data () {
      return {
        loginForm: {
          username: 'admin',
          password: '123456'
        }, // 表单验证
        loginFormRules: {
          username: [
            { required: true, message: '请输入用户名', trigger: 'blur' },
            { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
          ],
          password: [
            { required: true, message: '请输入用户密码', trigger: 'blur' },
            { min: 6, max: 18, message: '长度在 6 到 18 个字符', trigger: 'blur' }
          ]
        }
      }
    },
    methods: {
      // 表单重置按钮
      resetLoginForm () {
        // console.log(this)
        // resetFields：element-ui提供的表单方法
        this.$refs.loginFormRef.resetFields()
      },
      login () {
        // 表单预验证
        // valid：bool类型
        this.$refs.loginFormRef.validate(async valid => {
          // console.log(valid)
          if (!valid) return false
          // this.$http.post('login', this.loginForm): 返回值为promise
          // 返回值为promise，可加await简化操作 相应的也要加async
          const { data: res } = await this.$http.post('login', this.loginForm)
         console.log(res)
          if (res.meta.status !== 200) return this.$message.error('登录失败')
          this.$message.success('登录成功')
          // 1、将登陆成功之后的token, 保存到客户端的sessionStorage中; localStorage中是持久化的保存
          //   1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
          //   1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
          window.sessionStorage.setItem('token', res.data.token)
          // 2、通过编程式导航跳转到后台主页, 路由地址为：/home
         this.$router.push('/home')
        })
      }
    }
  }
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box {
    width: 450px;
    height: 360px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    background-color: #fff;
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
  .login_form {
    position: absolute;
    bottom: 60px;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns {
    display: flex;
    justify-content: center;
  }
  .info {
    font-size: 13px;
    margin: 10px 15px;
  }
</style>
